Why Yamaha calls it a Seal Guard is beyond me, since this really is a chain slider of sorts. Names aside, the following pictures are the new part, side to side with the part that has 5387 miles on it. Needless to say, the wear is unacceptable and I will be keeping an eye on the wear once I install my larger sprockets (front/rear). My simple understanding of geometry tells me the chain should not come in contact with the seal guard as often with larger diameter sprockets, bu we shall see, since Yamaha's design puts the pivot point for the swingarm off center, thus creating inevitable wear on the seal guard.
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